Heat Pump Installation and Repair in Sausalito

What actually fails, and what the symptoms mean

If you already have a heat pump and it is misbehaving, the symptom usually points at a short list of parts.

It runs but the air is not warm. On a heat pump, cool air at the register is sometimes normal. The system periodically reverses itself to melt frost off the outdoor coil, and during that cycle the indoor air goes lukewarm for several minutes. If it never recovers, the likely causes are a low refrigerant charge from a leak in the line set, a reversing valve that is not shifting, or a compressor that is running but not pumping.

The outdoor coil is a block of ice and stays that way. Frost forms whenever that coil is below both freezing and the dew point, and humid marine air makes frost far more likely at temperatures that feel mild to a person standing outside. Healthy systems clear it on schedule. A stuck defrost board, a failed coil sensor, or a badly restricted airflow path lets ice build until capacity collapses.

The electric bill jumps in winter with no comfort gain. That is usually auxiliary electric heat running when it should not be. Heat strips are the least efficient part of the system and exist as a backstop. A thermostat configured with furnace logic instead of heat pump staging will call them constantly.

It short cycles, or one room never gets comfortable. Oversizing is the most common design error in a mild climate, because a system picked from square footage rather than a room-by-room load calculation will be too large for a house with a small load. On ducted systems, undersized returns and leaky ducts in a vented crawlspace produce the same complaint.

Water where water should not be. The indoor coil produces condensate whenever it is cooling. A clogged drain line or a failed condensate pump shows up as staining under the air handler.

Nothing happens at all. Contactors, run capacitors, and low voltage control wiring account for a large share of no-heat and no-cool calls, and corroded contacts are more common on equipment that lives in salt air.

Four checks, in order

Before we quote anything, we run the same four checks in the same order. That prevents the two expensive mistakes: buying equipment that cannot be installed where you assumed, and buying capacity the house does not need.

Load. A Manual J calculation on the actual building: orientation, glazing, insulation, infiltration, and room-by-room. In Sausalito this almost always returns a smaller number than homeowners expect. Fog-cooled summers and a moderate winter do not generate large loads.

Distribution. Does usable ductwork exist, is it in conditioned space, and are the returns adequate? Many older homes here were built with wall furnaces or floor furnaces and have no duct system at all. That is not a problem, but it does select the equipment.

Power. A heat pump needs a dedicated 240V circuit and enough service capacity to carry it alongside everything else. Older services on the hillside and in Old Town are frequently at their practical limit once a range, a dryer, and a car charger are in the picture. This is a load calculation question, not a guess, and it is why an electrical panel upgrade in Sausalito belongs in the heat pump conversation rather than after it.

Placement. Where the outdoor unit physically goes, how the refrigerant lines get there, how it is anchored on a slope, and how far it sits from your neighbor's bedroom window. On flat suburban lots this is trivial. Here it is often the hardest of the four.

Once those four are answered, the option set narrows quickly.

Permits and code

Heat pump work in the city is permitted through the City of Sausalito Building Division, with applications submitted electronically through the city's permit center. If your address is in unincorporated Marin rather than inside city limits, the authority is the Marin County Community Development Agency instead. We pull the permit under our own license and meet the inspector. A heat pump changeout that swaps equipment, adds a 240V circuit, and abandons a gas appliance touches mechanical and electrical scope both, and unpermitted work becomes a title problem the day the house sells.

Three code items are worth understanding before you choose equipment.

Title 24. Replacement HVAC equipment has to meet California's building energy efficiency standards, either prescriptively or through performance modeling. The 2025 standards took effect January 1, 2026, per the California Energy Commission. Duct leakage testing is a routine part of a ducted changeout, which is one reason duct sealing shows up on quotes that homeowners expected to be equipment-only.

Air district rules. Sausalito sits fully inside the Bay Area Air Quality Management District, and BAAQMD has adopted zero-NOx standards for building appliances. What it does mean is that a homeowner replacing heating equipment in the second half of this decade will face a narrower gas option set than one replacing today, which is a legitimate input to a repair-or-replace decision on an aging furnace. These rules are actively worked on, so we confirm current requirements at the time of your project instead of quoting a phase date from memory. If your furnace is the thing that failed, our furnace repair page for Sausalito covers that side of the decision.

Refrigerant transition. R-22 production and import ended in the United States in 2020, so any surviving R-22 system is being repaired with reclaimed refrigerant, and that alone pushes most pre-2010 equipment toward replacement. R-410A is now being phased down under the AIM Act, and newly manufactured residential and light commercial equipment has to sit under a 700 global warming potential limit, and so what is on the shelf has changed. If you own a working R-410A system, this is not a reason to replace it. Service refrigerant remains available. It is a reason to ask what refrigerant a new system uses and who in your area is equipped to service it.

Where a property has no usable ground space at all, roof-mounted equipment is a real answer rather than a compromise, and it is common on mixed-use and multi-unit buildings near the waterfront. It carries its own requirements: structural review of the attachment, safe access for service, and a plan for getting a failed unit off the roof years from now.

Rebates: what is live

This is the part of a heat pump page that goes stale fastest, so here is the current picture rather than a list of programs that sound generous.

MCE. Marin's community choice electricity provider runs a heat pump rebate program covering heat pump HVAC and heat pump water heating. Eligibility is narrower than most homeowners assume: MCE describes it as open to "MCE customers who own and have lived in their single-family detached homes for at least 12 months in MCE's service area," and the work has to be done by a contractor listed in MCE's finder as offering the rebate.

MCE also states that its "rebates cannot be applied to a project retroactively," so the paperwork starts before the install, not after. There is a sequencing condition worth knowing about if you are also thinking about solar, battery storage, or an EV charger: MCE's terms address how those projects are timed relative to the heat pump install, in both directions. If you have a solar project in Sausalito on your list, raise it at the first visit so the order of operations does not cost you the rebate.

We check live program status before equipment is ordered, because the difference between a program being open and being fully subscribed is measured in weeks, not years.

Maintenance in a marine climate

A heat pump runs year round, which means it accumulates roughly twice the operating hours of a furnace that sits idle all summer. Service intervals matter more, not less.

Rinsing the outdoor coil is the single highest-value task near the water, because salt residue and fine grit trapped between fins choke the airflow the system depends on to reject heat. Filters need to be on a real schedule for the same reason: airflow is the constraint on both sides of the system. Once a year we verify refrigerant charge against superheat and subcooling rather than topping off by feel, exercise the defrost cycle before the cold months, clear the condensate drain, check that the thermostat's auxiliary heat lockout is configured for heat pump staging, and inspect the mounting hardware and cabinet for the corrosion that coastal installs earn. Our maintenance plans put that on a schedule so it does not depend on anyone remembering.

Where we work in Sausalito, and the power question

We work the hillside, the waterfront, and Old Town, along with every street in between. The pattern we see is consistent: the older stock above downtown and through Old Town tends toward smaller services, wall or floor heating, and no ducts, which pushes those homes toward ductless zoning. Flatter waterfront properties usually have somewhere to put equipment but present the toughest corrosion exposure. Steep lots in between are where line-set routing and structural mounting take the most planning.

One more thing belongs in the plan. Heating and cooling become an electrical load once you convert, and on the Sausalito hillside that runs into PG&E's Public Safety Power Shutoff program, under which PG&E turns off power during severe weather to help prevent wildfires. A gas furnace is no exception, since its blower is electric too. We install standby generators as a Certified Generac Generator installer, and battery storage paired with solar is the other route. Either one is cheaper and cleaner to design alongside the heat pump project than to retrofit around it later.

How to choose a heat pump contractor here

Six things separate a quote you can rely on from a number on a business card.

1. A room-by-room load calculation on your actual house, produced before equipment is selected, not a size chosen from square footage. 2. A written scope that names the outdoor unit, the indoor unit or units, the line-set length, and every piece of electrical work included. 3. The permit pulled in the correct jurisdiction, under the contractor's license. 4. One company holding both the C-20 mechanical and the C-10 electrical license, so the panel and circuit work is not a handoff to a subcontractor whose schedule you cannot see. 5. A stated position on corrosion protection, with a reason behind it, because a bayfront install and an inland install should not carry the same coil specification. 6. Rebate eligibility confirmed in writing before equipment is ordered.

We serve Marin, Sonoma, and Napa counties, the company dates to 1932, and we work from our Petaluma headquarters, carry a BBB A+ Rating, and are Diamond Certified. Our full range of work in town is on the Sausalito HVAC page.

What North Bay homeowners say

Two recent reviews from heat pump calls:

Heat pumps across Sausalito and Marin County

Related work at your address: HVAC in Sausalito, furnace repair in Sausalito, electrical panel upgrades in Sausalito, electrical work in Sausalito, solar in Sausalito, and the full service matrix for Sausalito. Nearby: heat pumps in Mill Valley and heating and cooling across Marin County.